AOA Estimation by TDOA in an Outdoor Mutipath Environment

This paper investigates the effects of multipath channel on angle of arrival (AOA) estimation with cross correlation time difference of arrival (TDOA) method. System model of a direction finding system that uses TDOA cross correlation method is presented. Effects of delay spread and average channel power delay profile on AOA estimation performance are demonstrated. Impact of diversity on AOA estimation performance is investigated. Performance improvements of two different diversity combining techniques, namely squarelaw combination diversity and selective combining diversity are compared.